I recevied this error when I upgraded my version of Zimbra. Anyone else have this problem? I'm going to restore my backup and try an incremental upgrade to see if that works.

Code:
Upgrading from 3.0.0_M2_746 to 3.1.0_GA_332
Sat Apr 15 17:24:08 2006: Stopping zimbra services
Sat Apr 15 17:24:11 2006: Checking mysql status
Sat Apr 15 17:24:11 2006: Starting mysql
Sat Apr 15 17:24:12 2006: SELECT value FROM config WHERE name = 'db.version'
Sat Apr 15 17:24:13 2006: Checking logger mysql status
Sat Apr 15 17:24:13 2006: Starting logger mysql
This appears to be 3.0.0_M2
Schema upgrade required
Sat Apr 15 17:24:14 2006: Running /opt/zimbra/libexec/scripts/migrate20051021-UniqueVolume.pl
Sat Apr 15 17:24:15 2006: SELECT value FROM config WHERE name = 'db.version'
Sat Apr 15 17:24:15 2006: Verified schema version 21.
Sat Apr 15 17:24:15 2006: Updating volume table
Sat Apr 15 17:24:15 2006: ALTER TABLE volume
ADD UNIQUE i_name (name),
ADD UNIQUE i_path (path(255));


ERROR 1061 (42000) at line 1: Duplicate key name 'i_name'
Error while running '/opt/zimbra/bin/mysql --user=zimbra --password=vdDv4tC50MLqxfir_5NMQFklqIQ --database=zimbra --batch --skip-column-names'. at /opt/zimbra/libexec/scripts/Migrate.pm line 134,  line 1.
Sat Apr 15 17:24:16 2006: Script failed with code 1 - exiting
UPGRADE FAILED - exiting